Thomas l



(No Model.)

T. L. WALLACE. SAW.

No. 597,229. Patented Jan. 11, 1898.

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UNITED STATES PATENT Fries.

THOMAS L. IVALLAOE, OF INDIANAPOLIS, INDIANA, ASSIGNOR TO THE E. O. ATKINS (it COMPANY, OF SAME PLACE.

SAW.

SPECIFICATION forming part of Letters Patent No. 597,229, dated January 11, 1898. A li ati fil d November 20, 1896. Serial No. 612,806. (No model.)

To all whom it may concern:

Be it known that I, THOMAS L. WALLAoE, a citizen of the United States, residing at Indianapolis, in the county of Marion and State of Indiana, have inventedcertain new and useful Improvements in Saws, of which the following is a specification.

My present invention relates to insertedtooth saws; and it consists in a certain construction and arrangement of parts whereby the teeth are locked firmly in position, while the locking devices are so constructed as to be capable of repeated use as the cuttingbits or teeth are worn out and have to be replaced.

Referring to the accompanying drawings, which are made a part hereof and on which similar letters of reference indicate similar parts,Figure 1 is aside elevation of afragment of a saw-blade containing teeth and holding devices embodying my improvements; Fig. 2, a view of the tooth or bit and the parts of the locking device distributed or separate from each other 5 Fig. 3,a detail sectional view,on an enlarged scale, as seen when looking in the direction indicated by the arrows from the dotted line 3 3 in Fig. 1; and Fig. 4, a similar view as seen when looking in the direction indicated by the arrows from the dotted line 4 4. in Fig. l.

In said drawings the portions marked A represent the saw-blade; B, the cutting bit or tooth; O, the clamping device whereby said teeth are held in. position, and I) revoluble cams whereby the clamps O can be operated.

The saw-blade is shown as a fragment of the blade of a straight saw, such as a bandsaw. Obviously, however, the invention may be applied to any form of saws desired, such as circular saws. This saw blade or plate is only peculiar in. having cut therein the various recesses which are necessary to accommodate the designed cutting-teeth and their clamping and holding devices. As will be observed,the recesses which receive the rounded portion of the clamps G and which receive the cams D are each somewhat more than. a half-circle in order that said parts may be firmly retained therein, as will be readily understood.

The teeth or bits B are not in themselves much dissimilar from the corresponding bits or teeth used with some other forms of fas- 2,) into which corresponding projections on the clamps C enter and which serve to hold said teeth from being thrown out of place by the momentum of the saw.

The clamps O are of the form plainly shown in the drawings and are adapted to be placed in the throats of the saw under the teeth and engage and hold said teeth in place. One projection c engages with the notches n in the teeth and the rounded ends 0' engage with the corresponding openings in the sawblade, while the squared end c rests against a corresponding shoulder in the saw-blade. On the back side these clamps are curved and are A-shaped, as at c and at this end the cams D come in contact therewith, as will be understood and as will be presently more fully explained.

The cams D are round disks having squared central openings, and which are V-shaped on their peripheries, one side being flattened to form the cam, as shown most plainly in Fig. 2. They are inserted within the recesses formed therefor in the saw-plate, this being permitted by reason of the flattened. side, notwithstanding said recesses are somewhat more than half-circular in form, so that the largest diameter thereof is beyond the entrance point. hen these cams are first placed in position, they are turned so that their flattened side is outward, as shown at No. 3 in Fig. 1. The clamps O are then put in place and the teeth B inserted, after which the cams D are turned to the positions shown at Nos. 1 and 2, thus forcing the clamps O around against the teeth and locking them firmly in position. W'hcn it is desired to remove a tooth, it can be easily done by revolving the cams D back to the position shown at No. 3, when the clamps C will recede from contact With the teeth B, after which, of course, they may be easily removed. The locking and unlocking of the teeth is thus accomplished by merely revolving the cams D5 :a's hes heen explained. By this arrangement of parts the strain of the clamp is'n pward against the portionof ihe'blacle between the threats of the teethand does not in any mannerdistnrb:the tension of'the blade as a whole. This isof greet imPOlh ta-neefln band-sewsperticularly,as Variations H in the tension atdifierentpointsinthe'hlede are iiableto produce cracks and'destroy the desire to secure byLet-ters Patent, is-

The combination, in a saw, of the blede-- containing recesses fer-the, insertion of the teeth and retainingselamips, said reee'sses eaeh being formed onone side of the throatuns' der each tooth end'wi'th a, stmightiwal'l for seatfo'r the retary: operating-earn ,and terminating at. its lower end' in 'aysn'pport for the lower end of the. clamp, said ielamp formed within circular pert mounted in the aforesaid seat provided therefor in said recess, with an u pwardly-extending arm which forms the other: side of theteoth-s'eeket and is adapted to clamp and secure said tooth, its other encl'extending to restzinxthesnppoltt y provided therefor I in the'loweiv end of said V recess, said rotary cam mounted :in its seat lease said 'i-OO-th, said several parts being 375 insaid recess and adapted tooperateagainst I the under side of said elainpte secure or re formedwith engagingedges allsubstantielly as set forth I THGMAS 'L'. WALLACE. [U s Witnesses:

'CHESTER BRADFORD,' I JAMEs A; WALsiL In witnessWhe -eof I have'hereuntoset my a hand and seal, at Indianapolis, lndia na this leihday of N0 vember',A.'D.'1S95.' I 1 esnitahle distance from the outside to serve as a rest for one side of the tooth; aeir 'enlar portion'heneath said straight part to serve asthe clamp-seat, another circular per- "tion below said, clamp-seat to serve as the 

